Compilare: user.cpp: In function ‘int main()’: user.cpp:45:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&q); ^ user.cpp:50:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&x); ^ user.cpp: In function ‘long long int solve(long long int)’: user.cpp:35:17: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] return v[ans]; ^ user.cpp: In function ‘int main()’: user.cpp:35:17: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:18:27: note: ‘ans’ was declared here int left, right, mid, ans; ^